package top.cardone.web.servlet;

import lombok.Setter;
import lombok.extern.log4j.Log4j2;
import org.apache.commons.lang3.CharEncoding;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
import top.cardone.context.util.CodeExceptionUtils;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.Writer;
import java.util.Map;

/**
 * Created by yao hai tao on 2016/1/20.
 */
@Log4j2
public class HandlerExceptionResolver implements org.springframework.web.servlet.HandlerExceptionResolver {
	@Setter
	private String errorViewName = "error.ftl";

	@Override
	public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
		log.error(ex.getMessage(), ex);

		String servletPath = request.getServletPath();

		if (RequestMethod.GET.name().equalsIgnoreCase(request.getMethod()) && !org.apache.commons.lang3.StringUtils.startsWith(request.getContentType(), org.springframework.http.MediaType.APPLICATION_JSON_VALUE)) {
			ModelAndView model = new ModelAndView(this.errorViewName);

			Map<String, String> errorInfoMap = CodeExceptionUtils.newMap(servletPath, ex);

			model.addAllObjects(errorInfoMap);

			return model;
		}

		response.setCharacterEncoding(CharEncoding.UTF_8);
		response.setContentType(org.springframework.http.MediaType.APPLICATION_JSON_UTF8_VALUE);

		try (Writer out = response.getWriter()) {
			String json = CodeExceptionUtils.newString(servletPath, ex);

			out.write(json);

			out.flush();
		} catch (java.io.IOException e) {
			log.error(e.getMessage(), e);
		}

		return null;
	}
}
